The coracobrachialis
is a elongated, skinny muscle that acts completely on the shoulder joint. Its
main functions are to draw the arm forward and to pull the arm toward the
midline of the body. The muscle originates from the coracoid process, a small
part of the scapula. It inserts midway along the inside of the humerus, a long
bone in the upper arm.
The nerves go through the muscular system and "control" them making then feel and move. hope this helps
